Convolute amplifying hobn



H. o. PUTT CONVOLUTE AMPLIFYING HORN Filed May 15, 1924 Nova. 2 1926.

- Patented Now :2, 1926.

UNITED STATES,

PATE

,HARLIE o. ru'r'r, or ELKHART, nimANA.

convon'c'rn AMPLIIYING Bonn.

Application filedllay 15,

The object of my invention is to provide a novel convolute amplifying horn for use with radio apparatus and phonographs. \is an essential object of my invention to provide a hornwhich will take up. little s ace, but which is highly efficient in amplifying sound waves, and which is also artistic in appearance. I attain these and other-objects of my invention by the device illustrated in the accompanying drawings, in which:

Figure 1 is a side elevation of one form of my invention; 1

Fig. 2 is a vertical section on line 2-2 of Fig. l; v

gig; 3 is. another .form of my invention; Fig.4 is a-vertical section on line 4-4'0f Fig. 3. j

ike numerals indicate like parts in each of the several views.

Referring to the accompanying drawings, Iprovide a convolute amplifyin horn preferably formed of a plurality 0 sections, 1 and 2, suitably secured together, as by the 5 screws 3 to provide a convolute amplifying passage 5 terminating in the mouth 6, as

shown in Figs. 1 and 2. I provide a soundconveying or tone-tube 7 opening into'the small end of the convolute passage at 4, and

provide opposite enlargements 9 and 10 in the portions of the horn through which tube 7 passes. Tube 7 preferably projects through the horn and furnishes a means for mounting the same in connection with the diaphragm D, as shown in Fig. 1. While the enlargements 9 and Y10 are provided in order .to reduce the restriction of the tone chamberby the disposition of the tube 7 therethrough, the provision of these enlargements will be necessary only in the smaller sizes. In the larger sizes the cross-sectional area of the tone chamber orpassage will be great enough to'accommodate the tube 7 without serious hindrance to the passage of the tone-waves.

' The tube 7 may be positioned either as shown in Figs. 1 and 2, or may radiate in any desired direction from the center or small end of the amplifier. The usual bell-shaped flare is preferably formed separately and I suitably attached to the, large opening or mouth 6.

Another form of my invention is disclosed 1924. Serial N0. 713,584.

horn is preferably formed of two sections 11 and 12. At the small end 13 of the passage MI provide a short lateral sound conveying f tube 16 mounted in portion 17 of the. horn and communicating with the diaphram D, as-' shown in Fig. 4. I preferably provide a sultable base 18 on which the horn is mounted, as shown in Figs. 3 and 4:. The

horn terminates in a bell-shaped mouth 15 preferably alined with the exterior surface of the adjacent convolution of the horn, and

preferably formed integral therewith.

The point of juncture throughout the convolutions whenthe horn is made in two sections, as shown in Figs. 2 and 4, as well as the fit of the tubes 7 and 16, must be airtight.

- It is within the contemplation of my invention to cast or mold the horn in one piece by utilizing a suitable removable or collapsible core, or to provide a horn of stamped or,

pressed metal or other suitable material or composition.

It is also within the contemplation of my invention to construct my amplifying horn with a circular, elliptical or square cross sect1on. The preferred construction is to -mold, cast, or press the material into the.

desired form: 1

By constructing an amplifying horn as above described, I provide an amplifying I mechanism having great acoustical value, occupying the smallest possible space, and one which can be readily and cheaply manufactured by means of suitable. molds, patof the convolutions of the horn adjacent tothe said tone-tube being enlarged to prevent restriction of the passage at this point the tone-tube extending through the convolutions.

- in Figs. 3 and. 4, in which the amplifying I HABLIE o. PUTT.

amplifying 

